getting combobox selected item value on aspx page

[Tarang]

Hi ,
I have a user control having a radCombobox Now I want to use the selectedvalue from this dropdown on an aspx page where I want to use this selected value as an input parameter to a function which fills a normal dropdown list on this page based on what the value was selected.
I have called this function in the onitemsrequested event of the normal dropdown.Now the problem is that it always takes null.
As a result the dropdown is blank irrespective of what I choose.

Please let me know how to achieve this,if this is not possible by onitemsrequested event,I do not want to create a new user control having both the things on one page.Instead i want the page to call usercontrol value.
I tried using public property concept.it does not work.

Here is the event definition.

  [
protected void ddlCommodity_itemRequested(object o, RadComboBoxItemsRequestedEventArgs e)
    {
         string exchange1 = ExchangeType.Exchange;                               
         DataSet CommodityCodes = service.GetCommodities(exchange1);

        ddlCommodity.DataSource = CommodityCodes.Tables[0];
        ddlCommodity.DataTextField = "'ALL'";
        ddlCommodity.DataValueField = "'ALL'";
        ddlCommodity.DataBind();
    }


the property is
public string Exchange
    {
        get { return ddlExchangeType.SelectedValue;}
        set { ddlExchangeType.SelectedValue = value; }
    }
]

[Abhishek]

Hello Tarang,

I have tried one example for your issue. i am sending you some test code please have look over it.

Radcombo UserControl :

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="RadComboBox.ascx.cs"
    Inherits="LearnTelerikControls.UserControls.RadComboBox" %>
<telerik:RadComboBox ID="rcbBusinessUnits" runat="server" EnableEmbeddedSkins="false"
    ForeColor="Blue" Font-Underline="true" Width="400px" Font-Bold="true" AutoPostBack="true">
    <Items>
        <telerik:RadComboBoxItem Text="--Select--" Value="1" />
        <telerik:RadComboBoxItem Text="Item_1" Value="2" />
        <telerik:RadComboBoxItem Text="Item_2" Value="3" />
        <telerik:RadComboBoxItem Text="Item_3" Value="4" />
        <telerik:RadComboBoxItem Text="Item_4" Value="5" />
    </Items>
</telerik:RadComboBox>

Properties in(.cs) of User Control:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace LearnTelerikControls.UserControls
{
    public partial class RadComboBox : System.Web.UI.UserControl
    {
        public string Exchange
        {
            get { return rcbBusinessUnits.SelectedValue; }
            set { rcbBusinessUnits.SelectedValue = value; }
        }

        protected void Page_Load(object sender, EventArgs e)
        {
        }


    }
}

Now Aspx Code:

<%@ Page Title="" Language="C#" MasterPageFile="~/MainStarter.Master" AutoEventWireup="true"
    CodeBehind="NormalDropdown.aspx.cs" Inherits="LearnTelerikControls.RadCombo.NormalDropdown" %>

<%@ Register TagPrefix="RadComboBoxUserControl" TagName="RadComboBoxUserControl"
    Src="~/UserControls/RadComboBox.ascx" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="BodyContainer" runat="server">
    <table>
        <tr>
            <td>
                <RadComboBoxUserControl:RadComboBoxUserControl ID="rcbUserControl" runat="server" />
            </td>
        </tr>
        <tr>
            <td>
                New Combo:
            </td>
            <td>
                <telerik:RadComboBox ID="ddlCommodity" runat="server" EmptyMessage="Select a Values"
                    ShowMoreResultsBox="true" EnableLoadOnDemand="True" OnItemsRequested="ddlCommodity_itemRequested">
                </telerik:RadComboBox>
            </td>
        </tr>
    </table>
</asp:Content>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using Telerik.Web.UI;

namespace LearnTelerikControls.RadCombo
{
    public partial class NormalDropdown : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
        }

        protected void ddlCommodity_itemRequested(object o, RadComboBoxItemsRequestedEventArgs e)
        {
            BindCombo();
            ddlCommodity.SelectedValue = rcbUserControl.Exchange;
        }


        private void BindCombo()
        {
            DataTable dt = GetDataTable();

            ddlCommodity.DataSource = dt;
            ddlCommodity.DataTextField = "FirstName";
            ddlCommodity.DataValueField = "ID";
            ddlCommodity.DataBind();
        }

        private DataTable GetDataTable()
        {
            DataTable dt = new DataTable("TestTable");
            dt.Columns.Add("ID");
            dt.Columns.Add("FirstName");

            dt.Rows.Add(1, "Abhishek");
            dt.Rows.Add(2, "Adiya");
            dt.Rows.Add(3, "ABC");
            dt.Rows.Add(4, "PQR");
            dt.Rows.Add(5, "XYZ");
            return dt;
        }
    }
}

 Please try this with your code. Let me know if any query.

Thanks,
Abhishek K

[Tarang]

Hi,

Thanks for the reply.
Actually I wanted to pass the usercontrol selected value as a function parameter.for eg.your GetDataTable()parameter function takes rcbUserControl.Exchange as input parameter.Based on that the normalDropDown is to be populated.

Please help me how to achieve this.

Regards,
Tarang

[Tarang]

Hi,the problem got solved.

All i did was in the main page I declared a radcombobox type variable and assigned the usercontrol to it with help of find control.

protected

 

void commodity_ItemRequested(object o, RadComboBoxItemsRequestedEventArgs e)

 

{  

RadComboBox exchange1 = (RadComboBox)ExchangeType.FindControl("ddlExchangeType");  // I created this variable

 string ExchangeList = exchange1.SelectedValue;                                              //all properties of usecontrol can be accessed thru here

 DataSet CommodityCodes = service.GetCommodities(ExchangeList);

ddlCommodity.DataSource = CommodityCodes.Tables[0];

ddlCommodity.DataTextField =

"'ALL'";
ddlCommodity.DataValueField ="'ALL'";
ddlCommodity.DataBind();

 

}

It might be helpful if any one facing similar problem .There posting it.


Thanks
Tarang

[Abhishek]

Hello Tarang,

I have updated the code according to your requirement please have one look.

NormalDropdown.aspx


<%@ Page Title="" Language="C#" MasterPageFile="~/MainStarter.Master" AutoEventWireup="true"
    CodeBehind="NormalDropdown.aspx.cs" Inherits="LearnTelerikControls.RadCombo.NormalDropdown" %>

<%@ Register TagPrefix="RadComboBoxUserControl" TagName="RadComboBoxUserControl"
    Src="~/UserControls/RadComboBox.ascx" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="BodyContainer" runat="server">
    <table>
        <tr>
            <td>
                <RadComboBoxUserControl:RadComboBoxUserControl ID="rcbUserControl" runat="server" />
            </td>
        </tr>
        <tr>
            <td>
                <telerik:RadComboBox ID="ddlCommodity" runat="server" EmptyMessage="Select a Values" Height=""
                    ShowMoreResultsBox="true" EnableLoadOnDemand="True" OnItemsRequested="ddlCommodity_itemRequested">
                </telerik:RadComboBox>

            </td>
        </tr>
    </table>
</asp:Content>

---------------------------------------------------------------------------------------------------------
NormalDropdown.cs

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using Telerik.Web.UI;

 

namespace LearnTelerikControls.RadCombo

{

    public partial class NormalDropdown : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            if (!IsPostBack)

            {              

            }

        }

 

        protected void ddlCommodity_itemRequested(object o, RadComboBoxItemsRequestedEventArgs e)

        {           

            BindCombo();           

        }

 

 

        protected void BindCombo()

        {

            DataTable dt = GetDataTable(rcbUserControl.Exchange);           

            ddlCommodity.DataSource = dt;

            ddlCommodity.DataTextField = "Name";

            ddlCommodity.DataValueField = "ID";

            ddlCommodity.DataBind();

        }

 

       

 

        protected DataTable GetDataTable(string TypeID)

        {

            DataTable table = GetNewTable();

            table.Rows.Add(1, "Winter", null);

            table.Rows.Add(2, "Summer", null);

 

            table.Rows.Add(3, "Biathlon", 1);

            table.Rows.Add(4, "Figure skating", 1);

            table.Rows.Add(5, "Alpine skiing", 1);

            table.Rows.Add(6, "Ski jumping", 1);

 

            table.Rows.Add(7, "Basketball", 2);

            table.Rows.Add(8, "Boxing", 2);

            table.Rows.Add(9, "Swimming", 2);

            table.Rows.Add(10, "Volleyball", 2);

            table.Rows.Add(11, "Wrestling", 2);

            table.Rows.Add(12, "Cycling", 2);

 

            //filter the values from the datatable

            DataTable FilteredTable = GetNewTable();

            foreach (DataRow Item in table.Rows)

            {

                DataRow Row = FilteredTable.NewRow();

                    if(TypeID.Equals(Item[2].ToString()))

                    {

                        Row[0] = Item[0].ToString();

                        Row[1] = Item[1].ToString();

                        Row[2] = Item[2].ToString();

                        FilteredTable.Rows.Add(Row);

                    }

            }

 

            return FilteredTable;

        }

 

        protected DataTable GetNewTable()

        {

            DataTable table = new DataTable();

            table.Columns.Add("ID", typeof(int));

            table.Columns.Add("Name");

            table.Columns.Add("TypeID", typeof(int));

            return table;

        }

    }

}

RadComboBox.ascx :

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="RadComboBox.ascx.cs"
    Inherits="LearnTelerikControls.UserControls.RadComboBox" %>
<telerik:RadComboBox ID="rcbBusinessUnits" runat="server" EnableEmbeddedSkins="false"
    ForeColor="Blue" Font-Underline="true" Width="400px" Font-Bold="true" AutoPostBack="true">
    <Items>
        <telerik:RadComboBoxItem Text="--Select--" Value="0" />
        <telerik:RadComboBoxItem Text="Item_1" Value="1" />
        <telerik:RadComboBoxItem Text="Item_2" Value="2" />
    </Items>
</telerik:RadComboBox>

No Changes in the RadComboBox.cs
Let me know if any issue. I think you got the solution for your query.

Thanks,
Abhishek K